The least number of squares that must be added so that the line P-Q becomes…

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Inside a rectangular frame, a dashed vertical line runs from P at the top to Q at the bottom. Six shaded squares occupy five equal-height rows. From top to bottom: one square is immediately right of the line; one square is one column farther right; one square is immediately left of the line; two squares share a row, one a column farther left and one immediately right of the line; and one square is immediately left of the line. Three squares lie on each side of P-Q.

The least number of squares that must be added so that the line P-Q becomes the line of symmetry is ________

  1. A.

    4

  2. B.

    3

  3. C.

    6

  4. D.

    7

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